Brother interaction

I love to observe the interaction between those 2: 

• There is often competition for toys that results in crying from one of both (of both of them). 
• Kabouter loves to "supervise" his little brother and tell him and us what he's not supposed to do, ...
• Beertje wants to copy and join in on anything Kabouter is doing
• They can hug each other spontaneously
• They can sit and giggle together in a way that it's contagious for all of us